I was out deer hunting a couple days ago and had sent up in a very large bowl that gets some pressure. I took my place that I have learned serves as a funnel for the deer when the sun comes up and the hunters start hunting out the bowl.

I was glassing all over and notice a couple of lads in orange on the far side of the bowl starting to make their way down into the bowl and towards me. I thought that was great and starting to look even closer for deer coming my way through the high sagebrush. Sure enough a group of about 9 white butts started to bounce through the sage and as they came about 150 yards from me they had settled down to a walk. I looked over the bunch really close and found that all of them were does and thought what the heck I'm just going to watch them.

After going about 50-75 yards, they were now broadside to me but I had the wind in my face, the largest doe stopped and looked down the hill and charged off stomping her front legs. On a trail about 20 yards from them was a nice big light colored with a reddish tint coyote looking at the deer. She charges after him and he picked up his pace. I should have shot him but was concerned about spooking any possible bucks in that large bowl.

I thought it was interesting and something that I had not seen before but she did not hesitate and went after the yote. Interesting.

Always fun watching predator/prey interact.

My family was bike riding around a local lake on the Eastern edge of metro Denver, and I saw a coyote come over a hill running hard. About 30 yards behind him is a doe Antelope. I kept expecting her to break off the chase, but she just kept after him. I last saw them go over a hill maybe 3/4's of a mile away, both still running hard.

I have never noticed adult deer to concerned with coyotes. Most doe will run them off.
That being said, east Texas coyotes are twice the size of west Texas coyotes. East Texas deer are no where near as large as west or south Texas deer. Out East Texas coyotes that can approach 50 lbs are a bit more aggressive towards deer than out west.
Our Texas coyote population has grown significantly the past year. I attribute it to the recent drought where there were significant losses in livestock to starvation. Created a "buffet" for the predators and scavengers. Made for a healthy scenario for the regional coyotes and pups.

I watched a coyote/mule deer interaction in Western South Dakota last summer. Coyote was crossing the prairie, basically minding his own business. Mule deer does took after it, surrounded the coyote and proceeded to pound it into a pile of goo. Not the smartest Coyote, and a demonstration of extreme prejudice by the does.
Shotgun

In my observation, deer pay very little attention to a single coyote when it is not fawning season. Adult deer are not particularly vulnerable to a single coyote; only to a pack, and pack behavior seems to occur only when groceries are exceedingly slim.

Not being afield that much when fawns are young enough to be vulnerable, I can't say from experience, but my understanding is that deer are much more sensitive to coyote presence when fawns are vulnerable.